// Copyright 2015-present runtime.js project authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

'use strict';

const isaac = require('../../deps/isaac/isaac');

// isaac.js returns crazy numbers, both positive and negative.
// This function is called on an isaac.rand() call,
// It gets the number to qualify for all of the following:
//  * Positive,
//  * Whole number,
//  * 0 < n < 256
// This ensures the numbers are similar to the numbers
// generated by VirtioRNG.
function isaacToUint8(n) {
  return (n >>> 0) & 0xff;
}

exports.seed = isaac.seed;
exports.getByte = () => isaacToUint8(isaac.rand());
